1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
use crate::host;
use std::fs::File;
use std::os::unix::prelude::{FileTypeExt, FromRawFd, IntoRawFd, RawFd};
use std::path::PathBuf;
#[derive(Debug)]
pub struct FdEntry {
pub fd_object: FdObject,
pub rights_base: host::__wasi_rights_t,
pub rights_inheriting: host::__wasi_rights_t,
pub preopen_path: Option<PathBuf>,
}
impl FdEntry {
pub fn from_file(file: File) -> FdEntry {
unsafe { FdEntry::from_raw_fd(file.into_raw_fd()) }
}
pub unsafe fn from_raw_fd_for_io_desc(rawfd: RawFd, writable : bool) -> FdEntry {
let (ty, mut rights_base, rights_inheriting) =
(
host::__WASI_FILETYPE_CHARACTER_DEVICE,
host::RIGHTS_TTY_BASE,
host::RIGHTS_TTY_BASE,
);
if !writable {
rights_base &= !host::__WASI_RIGHT_FD_WRITE as host::__wasi_rights_t;
} else {
rights_base &= !host::__WASI_RIGHT_FD_READ as host::__wasi_rights_t;
}
FdEntry {
fd_object: FdObject {
ty: ty as u8,
rawfd,
needs_close: true,
},
rights_base,
rights_inheriting,
preopen_path: None,
}
}
}
impl FromRawFd for FdEntry {
// TODO: make this a different function with error handling, rather than using the trait method
unsafe fn from_raw_fd(rawfd: RawFd) -> FdEntry {
let (ty, mut rights_base, rights_inheriting) =
determine_type_rights(rawfd).expect("can determine file rights");
use nix::fcntl::{fcntl, OFlag, F_GETFL};
let flags_bits = fcntl(rawfd, F_GETFL).expect("fcntl succeeds");
let flags = OFlag::from_bits_truncate(flags_bits);
let accmode = flags & OFlag::O_ACCMODE;
if accmode == OFlag::O_RDONLY {
rights_base &= !host::__WASI_RIGHT_FD_WRITE as host::__wasi_rights_t;
} else if accmode == OFlag::O_WRONLY {
rights_base &= !host::__WASI_RIGHT_FD_READ as host::__wasi_rights_t;
}
FdEntry {
fd_object: FdObject {
ty: ty as u8,
rawfd,
needs_close: true,
},
rights_base,
rights_inheriting,
preopen_path: None,
}
}
}
// TODO: can probably make this safe by using fcntl directly rather than going through `File`
pub unsafe fn determine_type_rights(
rawfd: RawFd,
) -> Result<
(
host::__wasi_filetype_t,
host::__wasi_rights_t,
host::__wasi_rights_t,
),
host::__wasi_errno_t,
> {
let (ty, rights_base, rights_inheriting) = {
let file = File::from_raw_fd(rawfd);
let ft = file.metadata().unwrap().file_type();
// we just make a `File` here for convenience; we don't want it to close when it drops
std::mem::forget(file);
if ft.is_block_device() {
(
host::__WASI_FILETYPE_BLOCK_DEVICE,
host::RIGHTS_BLOCK_DEVICE_BASE,
host::RIGHTS_BLOCK_DEVICE_INHERITING,
)
} else if ft.is_char_device() {
if nix::unistd::isatty(rawfd).unwrap() {
(
host::__WASI_FILETYPE_CHARACTER_DEVICE,
host::RIGHTS_TTY_BASE,
host::RIGHTS_TTY_BASE,
)
} else {
(
host::__WASI_FILETYPE_CHARACTER_DEVICE,
host::RIGHTS_CHARACTER_DEVICE_BASE,
host::RIGHTS_CHARACTER_DEVICE_INHERITING,
)
}
} else if ft.is_dir() {
(
host::__WASI_FILETYPE_DIRECTORY,
host::RIGHTS_DIRECTORY_BASE,
host::RIGHTS_DIRECTORY_INHERITING,
)
} else if ft.is_file() {
(
host::__WASI_FILETYPE_REGULAR_FILE,
host::RIGHTS_REGULAR_FILE_BASE,
host::RIGHTS_REGULAR_FILE_INHERITING,
)
// } else if ft.is_socket() {
// use nix::sys::socket;
// match socket::getsockopt(rawfd, socket::sockopt::SockType).unwrap() {
// socket::SockType::Datagram => (
// host::__WASI_FILETYPE_SOCKET_DGRAM,
// host::RIGHTS_SOCKET_BASE,
// host::RIGHTS_SOCKET_INHERITING,
// ),
// socket::SockType::Stream => (
// host::__WASI_FILETYPE_SOCKET_STREAM,
// host::RIGHTS_SOCKET_BASE,
// host::RIGHTS_SOCKET_INHERITING,
// ),
// _ => return Err(host::__WASI_EINVAL as host::__wasi_errno_t),
// }
} else if ft.is_fifo() {
(
host::__WASI_FILETYPE_SOCKET_STREAM,
host::RIGHTS_SOCKET_BASE,
host::RIGHTS_SOCKET_INHERITING,
)
} else {
return Err(host::__WASI_EINVAL as host::__wasi_errno_t);
}
};
Ok((
ty as host::__wasi_filetype_t,
rights_base,
rights_inheriting,
))
}
#[derive(Debug)]
pub struct FdObject {
pub ty: host::__wasi_filetype_t,
pub rawfd: RawFd,
pub needs_close: bool,
// TODO: directories
}
impl Drop for FdObject {
fn drop(&mut self) {
if self.needs_close {
nix::unistd::close(self.rawfd).unwrap_or_else(|e| eprintln!("FdObject::drop(): {}", e));
}
}
}
|
